#include "bits/stdc++.h"
using namespace std;

#define REP(i, n) for(int i=0; i<(n); i++)
#define ALL(a) (a).begin(),(a).end()

string a, b;
signed main()
{
    cin >> a >> b;
    sort(ALL(a));
    sort(ALL(b));
    cout << (a==b ? "YES" : "NO") << endl;
    return 0;
}